This is called when the hash is evaluated in scalar context. In order
to mimic the behaviour of untied hashes, this method should return a
false value when the tied hash is considered empty. If this method does
-not exist, perl will make some educated guesses and return false when
-the hash is not inside an iteration. In this case, FIRSTKEY is called
-and the result will be a false value if FIRSTKEY returns the empty list,
-true otherwise.
+not exist, perl will make some educated guesses and return true when
+the hash is inside an iteration. If this isn't the case, FIRSTKEY is
+called, and the result will be a false value if FIRSTKEY returns the empty
+list, true otherwise.
In our example we can just call C<scalar> on the underlying hash
referenced by C<$self-E<gt>{LIST}>: